1. the Lyman-alpha Radiometer onboard PROBA-2
LYRA
the Lyman-alpha Radiometer onboard PROBA-2
Current Developments
in LYRA Calibration
SCSL4 Meeting Brussels 05 Nov 2007

2. Contents Responsivity and Radiometric Model
Purity and Calibration Software
Structure of Calibration Paper

3. Head 1
Responsivity
Estimation and
Measurements

4. Head 1
Responsivity
Estimated
Extension to
UV, VIS, IR

5. ^ Spectral Responsivity Measurement: 2.5 mm x 1.0 mm beam (BESSY NI)
< Channel 1-1 Flatfield Measurement: 10 x 8 x 0.6 mm steps

6. ^ Spectral Responsivity Measurement: 1.5 mm x 1.5 mm beam (BESSY GI)
< Channel 1-4 Flatfield Measurement: 13 x 13 x 0.3 mm steps

7. Channel 1-1
Ly XN + MSM 12
( /- nm)
Spectral
Responsivity
and Output,
Simulated with
TIMED/SEE
Spectra

8. Channel 1-1
Simulated Relations between Input and Output

9. Channel 1-3
Al + MSM 11
( nm)
Spectral
Responsivity
and Output,
Simulated with
TIMED/SEE
Spectra

10. Channel 1-3
Simulated Relations between Input and Output

11. The Calibration of LYRA, a Solar UV Radiometer on PROBA2
Abstract
1. Introduction
2. Steps of the Data Calibration Process
2.1. Raw Data
2.2. Exposure Time, Deadtime
2.3. Dark Current
2.4. Voltage-Frequency-Converter
2.5. Resistance
2.6. Radiometric Model
Aperture Area Filter Transmittance Detector Responsivity and Flatfields Linearity vs. Photon Flux Stability Purity
2.7. Monitoring
Degradation Off-pointing Orbit Variations
3. Discussions and Conclusions
References